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"We buy from over 10 different labs and have a large selection. I have a professional shipping agent who packaged goods so has a very high delivery success rate to the UK."

Because requirements can vary based on the animal, the airline and the destination, pet owners often hire shipping agents to help them navigate the process.

Sara's shipping agent found another airline which could transfer their pets for a lower price.

All three firms were active shippers of Russian oil and fuels up until September-October when they started scaling down their involvement, according to the traders and data from shipping agents seen by Reuters.

The shipping agent said the details are all new requirements that the safety administrations did not ask for before.